Total mercury released to the environment by human activities
Journal Article
·
· Environmental Science and Technology
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Harvard Univ., Cambridge, MA (United States)
- Electric Power Research Institute, Palo Alto, CA (United States)
Here, we estimate that a cumulative total of 1.5 (1.0–2.8) Tg (teragrams, or million tonnes) of mercury (Hg) have been released by human activities up to 2010, 73% of which was released after 1850. Of this liberated Hg, 470 Gg (gigagrams, or thousand tonnes) was emitted directly into the air, and 74% of the air emissions were elemental Hg. Cumulatively, about 1.1 Tg were released to land and water bodies. Though annual releases of Hg have been relatively stable since 1880 at 8 ± 2 Gg, except for wartime, the distributions of those releases among source types, world regions, and environmental media have changed dramatically. Production of Hg accounts for 27% of cumulative Hg releases to the environment, followed by silver mining (24%) and chemicals manufacturing (12%). North America (30%), Europe (27%), and Asia (16%) have experienced the largest releases. Biogeochemical modeling shows a 3.2-fold increase in the atmospheric burden relative to 1850 and a contemporary atmospheric reservoir of 4570 Mg, both of which agree well with observational constraints. We find that approximately 40% (390 Gg) of the Hg discarded to land and water must be sequestered at contaminated sites to maintain consistency with recent declines in atmospheric Hg concentrations.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Electric Power Research Institute (EPRI); USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1364136
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 11 Vol. 51; ISSN 0013-936X
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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